Tunnels and Viaducts on the A25 Motorway in Italy, by Kilometre Point

• 56entries listed
• 4.57 kmlongest bore
• 27.7 kmtotal length

The record table

How this archive measures: lengths, bores, dates and ordering

How this table is compiled

The 58 entries are grouped on the page under 10 headings — exit cocullo (15), exit pratola peligna - sulmona (12), exit casauria - torre de' passeri (9), exit alanno - scafa (7) and connection "torano" a24 roma - teramo (3) — a classification the table carries as section breaks rather than as a column of its own.

Between the longest and the tenth-longest the drop is 3.83 km, which is the part of the table that changes when a single scheme opens. Where one of these 56 lengths disagrees with an operator's own figure for Italy, the table keeps the published value and notes the difference instead of averaging the two.

51 entries fall below a kilometre, short enough that portals and approaches usually decided their cost more than the bore itself. Read down the direction pescara column, the 57 values run from 30 to 6 645 with a midpoint at 350; the spread rather than the maximum is what says how uneven this set is.

Lengths for Italy are recorded in metres which is how the operators publish them and why the shortest entry here reads as 30 m and not a rounded figure. The longest entry is 152.2 times the shortest and 13.7 times the median, which is the quickest measure of how uneven the table is.

A new scheme in Italy would have to beat 4.57 km to change the head of this table, and that is the figure worth rechecking when one opens. The eighth longest is Zappino at 0.85 km, which is about where this record stops being about record holders and starts being about ordinary infrastructure.

Reading the figures

Also recorded here are Palazzo at 1.02 km and Aterno at 0.89 km. A tunnel list for Italy reads differently from a neighbouring country's: 1 of these 56 structures pass three kilometres, and the same journey time is bought with one long bore in one country and a dozen short ones in another.

This page records the structures catalogued along the A25 in Italy, in a tunnel almanac maintained at this address since the late 1990s. Laid end to end the entries on this page would run 27.7 km, which is a number with no engineering meaning but a useful sense of the scale of what is catalogued.

The route table lists 56 structures with a recorded length, giving both carriageways where the two bores differ. Bussi at 1.99 km and Gole di Popoli at 1.97 km follow it, and lengths are given per carriageway because the two bores of a dual route are rarely cut to the same length.

The next two longest are Bussi at 1.99 km and Gole di Popoli at 1.97 km. The table on this page runs to 58 rows and records Tunnel / Viaduct, Direction Pescara, Direction Torano and Notes for each of them, which is the shape the original compiler chose rather than one imposed here.

The entries sum to roughly 27.7 km of bore, an average of about 0.49 km each, though that average describes no actual row. On 1 of the structures here the two carriageways are not the same length, which is why the archive records each direction separately rather than one figure per crossing.